ast-get-values-by-key

Extract values and paths from AST by keys OR set them by keys

Install

This package is pure ESM. If you're not ready yet, install an older version of this program, 3.1.0 (npm i ast-get-values-by-key@3.1.0).

npm i ast-get-values-by-key

Quick Take

import { strict as assert } from "assert";

import { getByKey } from "ast-get-values-by-key";

// GETTER
// ======

// returns "object-path" notation paths where arrays use dots:
assert.deepEqual(
  getByKey(
    {
      parsed: [
        {
          tag: "html",
        },
      ],
    },
    "tag", // value to search for
  ),
  [{ val: "html", path: "parsed.0.tag" }],
);

// SETTER
// ======

assert.deepEqual(
  getByKey(
    {
      parsed: [
        {
          tag: "html",
        },
      ],
      foo: {
        tag: null,
      },
      bar: {
        tag: null,
      },
    },
    "tag", // value to search for
    [123, 456], // pot of values to pick from (one result not enough)
  ),
  {
    parsed: [
      {
        tag: 123,
      },
    ],
    foo: {
      tag: 456,
    },
    bar: {
      tag: null, // value pot was depleted and there was nothing left to put here
    },
  },
);

Documentation

Please visit codsen.com for a full description of the API.

Contributing

To report bugs or request features or assistance, raise an issue on GitHub.

Licence

MIT License.

Copyright © 2010-2025 Roy Revelt and other contributors.